Headings should be in sequential order to ensure screen readers can properly convey HTML content. See more information on the WCAG Guideline: 2.4.10 Section Headings.
The Document’s Heading Structure Is Not Properly Nested
- Find the heading that is not in sequential order.
- Change the heading level to ensure sequential order is maintained. For example, if the first heading level was set to 1, change the second heading level to 2.